6.0.9
msitarzewski/agency-agents6.0.9Sep 1, 2026by emscripten-bot
Upgrading?
AI Summary
Emscripten 6.0.9 marks the `WASM_BINDGEN` setting as experimental and optimizes streaming performance for cross-origin storage operations by utilizing `instantiateStreaming`.
Key Highlights
- The `WASM_BINDGEN` setting is now marked as experimental with compiler warnings.
- Cross-origin storage cache paths now use `WebAssembly.instantiateStreaming()` for better overlap.
- Improvements to `Blob.stream()` and `tee()` usage for download/compile overlap.
New Features
- Experimental `WASM_BINDGEN` setting.
- Optimized streaming for cache-hit and cache-miss paths using modern browser APIs.
Full Release Notes
## What's Changed - The `WASM_BINDGEN` setting is now marked experimental, and enabling it produces a compiler diagnostic warning, since the integration is still evolving and subject to change. (#27616) - The `-sCROSS_ORIGIN_STORAGE` cache-hit and cache-miss paths now use `WebAssembly.instantiateStreaming()` (via `Blob.stream()` and a `tee()`'d network body respectively), so enabling the flag no longer loses the download/compile overlap of the standard streaming path. (#27609) ## Contributors Thanks to the following contributors: @sbc100 (17) @brendandahl (3) @guybedford (3) @tomayac (2) @dschuff (1) **Full Changelog**: https://github.com/emscripten-core/emscripten/compare/6.0.8...6.0.9
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